Definition: You are given a question on conceptual physics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: A magnetic force can act on an electron even when it
(A)is at rest (B)moves parallel to magnetic field lines (C)Both of these (D)Neither of these

D